Merge GDB 7.5.1

gdb/inf-child.c

 /* Default child (native) target interface, for GDB when running under
    Unix.
 
    Copyright (C) 1988-1996, 1998-2002, 2004-2005, 2007-2012 Free
    Software Foundation, Inc.
 
    This file is part of GDB.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include "defs.h"
 #include "regcache.h"
 #include "memattr.h"
 #include "symtab.h"
 #include "target.h"
 #include "inferior.h"
 #include "gdb_string.h"
+#include "gdb_stat.h"
 #include "inf-child.h"
+#include "gdb/fileio.h"
+#include "agent.h"
+#include "gdb_wait.h"
+
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>          /* for MAXPATHLEN */
+#endif
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+/* Helper function for child_wait and the derivatives of child_wait.
+   HOSTSTATUS is the waitstatus from wait() or the equivalent; store our
+   translation of that in OURSTATUS.  */
+void
+store_waitstatus (struct target_waitstatus *ourstatus, int hoststatus)
+{
+  if (WIFEXITED (hoststatus))
+    {
+      ourstatus->kind = TARGET_WAITKIND_EXITED;
+      ourstatus->value.integer = WEXITSTATUS (hoststatus);
+    }
+  else if (!WIFSTOPPED (hoststatus))
+    {
+      ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
+      ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (hoststatus));
+    }
+  else
+    {
+      ourstatus->kind = TARGET_WAITKIND_STOPPED;
+      ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (hoststatus));
+    }
+}
 
 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
    for all registers.  */
 
 static void
 inf_child_fetch_inferior_registers (struct target_ops *ops,
                                     struct regcache *regcache, int regnum)
 {
   if (regnum == -1)
     {
@@ skipping 61 matching lines @@
 }
 
 static char *
 inf_child_pid_to_exec_file (int pid)
 {
   /* This version of Unix doesn't support translation of a process ID
      to the filename of the executable file.  */
   return NULL;
 }
 
+
+/* Target file operations.  */
+
+static int
+inf_child_fileio_open_flags_to_host (int fileio_open_flags, int *open_flags_p)
+{
+  int open_flags = 0;
+
+  if (fileio_open_flags & ~FILEIO_O_SUPPORTED)
+    return -1;
+
+  if (fileio_open_flags & FILEIO_O_CREAT)
+    open_flags |= O_CREAT;
+  if (fileio_open_flags & FILEIO_O_EXCL)
+    open_flags |= O_EXCL;
+  if (fileio_open_flags & FILEIO_O_TRUNC)
+    open_flags |= O_TRUNC;
+  if (fileio_open_flags & FILEIO_O_APPEND)
+    open_flags |= O_APPEND;
+  if (fileio_open_flags & FILEIO_O_RDONLY)
+    open_flags |= O_RDONLY;
+  if (fileio_open_flags & FILEIO_O_WRONLY)
+    open_flags |= O_WRONLY;
+  if (fileio_open_flags & FILEIO_O_RDWR)
+    open_flags |= O_RDWR;
+/* On systems supporting binary and text mode, always open files in
+   binary mode. */
+#ifdef O_BINARY
+  open_flags |= O_BINARY;
+#endif
+
+  *open_flags_p = open_flags;
+  return 0;
+}
+
+static int
+inf_child_errno_to_fileio_error (int errnum)
+{
+  switch (errnum)
+    {
+      case EPERM:
+        return FILEIO_EPERM;
+      case ENOENT:
+        return FILEIO_ENOENT;
+      case EINTR:
+        return FILEIO_EINTR;
+      case EIO:
+        return FILEIO_EIO;
+      case EBADF:
+        return FILEIO_EBADF;
+      case EACCES:
+        return FILEIO_EACCES;
+      case EFAULT:
+        return FILEIO_EFAULT;
+      case EBUSY:
+        return FILEIO_EBUSY;
+      case EEXIST:
+        return FILEIO_EEXIST;
+      case ENODEV:
+        return FILEIO_ENODEV;
+      case ENOTDIR:
+        return FILEIO_ENOTDIR;
+      case EISDIR:
+        return FILEIO_EISDIR;
+      case EINVAL:
+        return FILEIO_EINVAL;
+      case ENFILE:
+        return FILEIO_ENFILE;
+      case EMFILE:
+        return FILEIO_EMFILE;
+      case EFBIG:
+        return FILEIO_EFBIG;
+      case ENOSPC:
+        return FILEIO_ENOSPC;
+      case ESPIPE:
+        return FILEIO_ESPIPE;
+      case EROFS:
+        return FILEIO_EROFS;
+      case ENOSYS:
+        return FILEIO_ENOSYS;
+      case ENAMETOOLONG:
+        return FILEIO_ENAMETOOLONG;
+    }
+  return FILEIO_EUNKNOWN;
+}
+
+/* Open FILENAME on the target, using FLAGS and MODE.  Return a
+   target file descriptor, or -1 if an error occurs (and set
+   *TARGET_ERRNO).  */
+static int
+inf_child_fileio_open (const char *filename, int flags, int mode,
+                       int *target_errno)
+{
+  int nat_flags;
+  int fd;
+
+  if (inf_child_fileio_open_flags_to_host (flags, &nat_flags) == -1)
+    {
+      *target_errno = FILEIO_EINVAL;
+      return -1;
+    }
+
+  /* We do not need to convert MODE, since the fileio protocol uses
+     the standard values.  */
+  fd = open (filename, nat_flags, mode);
+  if (fd == -1)
+    *target_errno = inf_child_errno_to_fileio_error (errno);
+
+  return fd;
+}
+
+/* Write up to LEN bytes from WRITE_BUF to FD on the target.
+   Return the number of bytes written, or -1 if an error occurs
+   (and set *TARGET_ERRNO).  */
+static int
+inf_child_fileio_pwrite (int fd, const gdb_byte *write_buf, int len,
+                         ULONGEST offset, int *target_errno)
+{
+  int ret;
+
+#ifdef HAVE_PWRITE
+  ret = pwrite (fd, write_buf, len, (long) offset);
+#else
+  ret = -1;
+#endif
+  /* If we have no pwrite or it failed for this file, use lseek/write.  */
+  if (ret == -1)
+    {
+      ret = lseek (fd, (long) offset, SEEK_SET);
+      if (ret != -1)
+        ret = write (fd, write_buf, len);
+    }
+
+  if (ret == -1)
+    *target_errno = inf_child_errno_to_fileio_error (errno);
+
+  return ret;
+}
+
+/* Read up to LEN bytes FD on the target into READ_BUF.
+   Return the number of bytes read, or -1 if an error occurs
+   (and set *TARGET_ERRNO).  */
+static int
+inf_child_fileio_pread (int fd, gdb_byte *read_buf, int len,
+                        ULONGEST offset, int *target_errno)
+{
+  int ret;
+
+#ifdef HAVE_PREAD
+  ret = pread (fd, read_buf, len, (long) offset);
+#else
+  ret = -1;
+#endif
+  /* If we have no pread or it failed for this file, use lseek/read.  */
+  if (ret == -1)
+    {
+      ret = lseek (fd, (long) offset, SEEK_SET);
+      if (ret != -1)
+        ret = read (fd, read_buf, len);
+    }
+
+  if (ret == -1)
+    *target_errno = inf_child_errno_to_fileio_error (errno);
+
+  return ret;
+}
+
+/* Close FD on the target.  Return 0, or -1 if an error occurs
+   (and set *TARGET_ERRNO).  */
+static int
+inf_child_fileio_close (int fd, int *target_errno)
+{
+  int ret;
+
+  ret = close (fd);
+  if (ret == -1)
+    *target_errno = inf_child_errno_to_fileio_error (errno);
+
+  return ret;
+}
+
+/* Unlink FILENAME on the target.  Return 0, or -1 if an error
+   occurs (and set *TARGET_ERRNO).  */
+static int
+inf_child_fileio_unlink (const char *filename, int *target_errno)
+{
+  int ret;
+
+  ret = unlink (filename);
+  if (ret == -1)
+    *target_errno = inf_child_errno_to_fileio_error (errno);
+
+  return ret;
+}
+
+/* Read value of symbolic link FILENAME on the target.  Return a
+   null-terminated string allocated via xmalloc, or NULL if an error
+   occurs (and set *TARGET_ERRNO).  */
+static char *
+inf_child_fileio_readlink (const char *filename, int *target_errno)
+{
+  /* We support readlink only on systems that also provide a compile-time
+     maximum path length (MAXPATHLEN), at least for now.  */
+#if defined (HAVE_READLINK) && defined (MAXPATHLEN)
+  char buf[MAXPATHLEN];
+  int len;
+  char *ret;
+
+  len = readlink (filename, buf, sizeof buf);
+  if (len < 0)
+    {
+      *target_errno = inf_child_errno_to_fileio_error (errno);
+      return NULL;
+    }
+
+  ret = xmalloc (len + 1);
+  memcpy (ret, buf, len);
+  ret[len] = '\0';
+  return ret;
+#else
+  *target_errno = FILEIO_ENOSYS;
+  return NULL;
+#endif
+}
+
+static int
+inf_child_use_agent (int use)
+{
+  if (agent_loaded_p ())
+    {
+      use_agent = use;
+      return 1;
+    }
+  else
+    return 0;
+}
+
+static int
+inf_child_can_use_agent (void)
+{
+  return agent_loaded_p ();
+}
+
 struct target_ops *
 inf_child_target (void)
 {
   struct target_ops *t = XZALLOC (struct target_ops);
 
   t->to_shortname = "child";
   t->to_longname = "Unix child process";
   t->to_doc = "Unix child process (started by the \"run\" command).";
   t->to_open = inf_child_open;
   t->to_post_attach = inf_child_post_attach;
@@ skipping 11 matching lines @@
   t->to_post_startup_inferior = inf_child_post_startup_inferior;
   t->to_follow_fork = inf_child_follow_fork;
   t->to_can_run = inf_child_can_run;
   t->to_pid_to_exec_file = inf_child_pid_to_exec_file;
   t->to_stratum = process_stratum;
   t->to_has_all_memory = default_child_has_all_memory;
   t->to_has_memory = default_child_has_memory;
   t->to_has_stack = default_child_has_stack;
   t->to_has_registers = default_child_has_registers;
   t->to_has_execution = default_child_has_execution;
+  t->to_fileio_open = inf_child_fileio_open;
+  t->to_fileio_pwrite = inf_child_fileio_pwrite;
+  t->to_fileio_pread = inf_child_fileio_pread;
+  t->to_fileio_close = inf_child_fileio_close;
+  t->to_fileio_unlink = inf_child_fileio_unlink;
+  t->to_fileio_readlink = inf_child_fileio_readlink;
   t->to_magic = OPS_MAGIC;
+  t->to_use_agent = inf_child_use_agent;
+  t->to_can_use_agent = inf_child_can_use_agent;
   return t;
 }